They could save your life. My uncle was using a screw gun today and got his hair caught in it. He is now bald on 3/4 of his head and has many stiches. He is lucky that he got away with only that. The doctors told him that they doubt if his hair will ever grow back and he is in sever pain as well as emotionally distressed.
Please remember to tie your hair back and not to wear loose clothing.

Ouch! Definitely thanks for that tip. Did the warning say 'hair may get caught' or something?

Warnings on tools like that usually say to keep hair tied back and not to wear loose clothing.